PTFE membrane electrodes with increased sensitivity for gas sensor applications

被引：21

作者：

Wienecke, M ^{[1
]}

Bunescu, MC ^{[1
]}

Pietrzak, M ^{[1
]}

Deistung, K ^{[1
]}

Fedtke, P ^{[1
]}

机构：

[1] Inst Oberflachen & Dunnschichttechn, Hsch Wismar, D-23952 Wismar, Germany

来源：

SYNTHETIC METALS | 2003年 / 138卷 / 1-2期

关键词：

membrane-electrode; amperometric gas sensor; three-phase boundary; carbon nanotube; nanocomposite;

D O I：

10.1016/S0379-6779(02)01281-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report about different methods to increase the surface area of the membrane-electrode and the results of the surface morphology examination. After vacuum evaporation coating of the PTFE membranes with metals the surface morphology of the sintered PTFE membranes has been changed, due to the thermal stress relaxation during the cooling of the metallic film. The particular "hair morphology" of the surface has increased the three-phase boundary area, followed by an enhancement of the gas sensor sensitivity. A further improvement of the utilisation efficiency of the metal catalyst and of the sensitivity (from the "ppm" to "ppb" gas concentration level) was obtained using the new membrane-electrode assembly composed of PTFE membrane and a nanocomposite material of carbon nanotubes (CNT) and PTFE. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：165 / 171

页数：7

共 12 条

[1] PREPARATION OF POROUS-ELECTRODES AND LAMINATED ELECTRODE-MEMBRANE STRUCTURES FOR POLYMER ELECTROLYTE FUEL-CELLS (PEFC) [J].

BOLWIN, K ;

GULZOW, E ;

BEVERS, D ;

SCHNURNBERGER, W .

SOLID STATE IONICS, 1995, 77 :324-330

[2]

BUNESCU MC, 2002, P MAT WEEK 2001 WERK

[3]

DEBE MK, 1999, Patent No. 5879827

[4] Preparation of polymeric and metallic nanostructures using a template-based deposition method [J].

Demoustier-Champagne, S ;

Delvaux, M .

MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 2001, 15 (1-2) :269-271

[5]

Fujita J.-I., 1996, FUEL CELL. 1996 Fuel Cell Seminar. Program and Abstracts, P628

[6] Dry layer preparation and characterisation of polymer electrolyte fuel cell components [J].

Gülzow, E ;

Schulze, M ;

Wagner, N ;

Kaz, T ;

Reissner, R ;

Steinhilber, G ;

Schneider, A .

JOURNAL OF POWER SOURCES, 2000, 86 (1-2) :352-362

[7] Fabrication of polymer electrolyte fuel cell (PEFC) H-2 sensors [J].

Hong, YJ ;

Oh, SM .

SENSORS AND ACTUATORS B-CHEMICAL, 1996, 32 (01) :7-13

[8]

LAUER JM, 1997, Patent No. 0777121

[9]

LEE SB, 1998, Patent No. 5716506

[10]

PARSONAGE EE, 1994, Patent No. 53338430

← 1 2 →